考虑控制方式的MMC-HVDC系统单极接地故障电流计算方法
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TM721

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国家重点研发计划项目(2018YFB0904600)


Pole-to-Ground Fault Current Calculation Method for MMC-HVDC System Considering MMC Control
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    摘要:

    直流侧单极接地故障是基于模块化多电平换流器(modular mutilevel converter, MMC)的高压直流(high voltage direct current, HVDC)输电系统最常见的故障类型,一般以换流站闭锁前子模块电容放电电流近似故障电流,忽略了换流站控制环节的影响,结果存在误差。提出一种考虑换流站控制方式的故障电流计算方法,针对换流站主从控制,改进了基于微分方程的求解方法,在故障后的等效回路中使用并联受控电流源将换流站控制环节纳入考虑范围,分别对定功率控制与定电压控制方式下的故障电流进行计算。在PSCAD/EMTDC平台搭建了两端MMC-HVDC系统模型,验证了所提方法的准确性。

    Abstract:

    Pole-to-ground fault on DC side is the most common type of fault in modular multilevel converter high voltage direct current(MMC-HVDC) transmission system. Generally, the sub-module capacitor discharge current is used to approximate the fault current before converter blocking. In this process, the influence of MMC control dynamics is ignored, so the results are inaccurate. Aiming at the master-slave control mode of the converter, this paper improved the solving method based on differential equations. In the equivalent circuit after fault, a parallel controlled current source was used to take the control dynamics of the converter into consideration. The fault current under the influence of power and DC voltage controllers were calculated respectively. A two-terminal MMC-HVDC system was built in PSCAD/EMTDC platform to verify the accuracy of the proposed method.

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刘坤,张英敏,彭宇锋. 考虑控制方式的MMC-HVDC系统单极接地故障电流计算方法[J]. 科学技术与工程, 2021, 21(23): 9890-9896.
Liu Kun, Zhang Yingmin, Peng Yufeng. Pole-to-Ground Fault Current Calculation Method for MMC-HVDC System Considering MMC Control[J]. Science Technology and Engineering,2021,21(23):9890-9896.

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  • 收稿日期:2021-01-09
  • 最后修改日期:2021-05-26
  • 录用日期:2021-04-13
  • 在线发布日期: 2021-08-31
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